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Meeting Server periodically drops all XMPP users

Hello.

We have these strange messages in syslog:

05:01:46 cms.local postgres[84994]:  [2-1] LOG:  could not send data to client: Broken pipe
05:01:46 cms.local postgres[84994]:  [3-1] FATAL:  connection to client lost
05:01:47 cms.local postgres[84998]:  [2-1] LOG:  could not send data to client: Broken pipe
05:01:47 cms.local postgres[84998]:  [3-1] FATAL:  connection to client lost
05:01:47 cms.local host: server:  INFO : Stream error: invalid-xml
05:01:47 cms.local host: server:  INFO : XMPP component connection disconnected due to failure reason: "unknown"
05:01:47 cms.local host: server:  INFO : deinstantiating user "User1_AZ@cma.MYDOM"
05:01:47 cms.local host: server:  INFO : deinstantiating user "User2_EA@cma.MYDOM"
..... all currently registered CMA users
05:01:47 cms.local xmppd[7]:  N-MLink-Notice SID-14257 Sending error for S2S connection to domain NA [127.0.0.1] (unknown) (invalid-xml)
05:01:47 cms.local host: server:  INFO : call 2922: lack of expected reports for received audio
05:01:47 cms.local host: server:  INFO : calls lacking reports; 1 / 11
05:01:47 cms.local host: server:  INFO : Attempting XMPP connection to 127.0.0.1:5223
05:01:47 cms.local host: server:  INFO : XMPP connected to 127.0.0.1:5223
05:01:47 cms.local xmppd[7]:  D-MLink-Auth SID-14314 New client SSL connection from 127.0.0.1
05:01:47 cms.local xmppd[7]:  I-MLink-Info TLS conn IP=127.0.0.1 version=TLSv1/SSLv3 cipher=ECDHE-RSA-AES256-GCM-SHA384 secret-bits=256 processed-bits=256 compression="(None)" preliminary certificate verification failed
05:01:47 cms.local host: server:  INFO : XMPP component connection connected
05:01:47 cms.local host: server:  INFO : successfully pushed web bridge certificate to "https://cma-web.MYDOM/serverUpload.sf?type=xmppCertificate&source=50198a30-14c9-4eb3-92e4-8497bc948e81"
05:01:47 cms.local host: server:  INFO : successfully pushed web bridge certificate to "https://cma-web.MYDOM/serverUpload.sf?type=xmppCertificate&source=e7b05fe8-3771-48d4-a7fb-4fb44d76c0f2"
05:01:47 cms.local postgres[85008]:  [2-1] LOG:  could not send data to client: Broken pipe
05:01:47 cms.local postgres[85008]:  [3-1] FATAL:  connection to client lost
05:01:47 cms.local host: server:  INFO : instantiating user "User1_@cma.MYDOM"
05:01:47 cms.local host: server:  INFO : instantiating user "Userxx_VV@cma.MYDOM"
..... all CMA users register back

Users are being disconnecting and connecting back every 30-50 minutes.

Server version is 2.3.3

Certificate is fine and valid untill 2021

cms.local> xmpp
Enabled                 : true
Clustered               : false
Domain                  : cma.MYDOM
Listening interfaces    : a
Key file                : cms_2019_2021.key
Certificate file        : cms_2019_2021.crt
CA Bundle file          : cms_2019_2021_inter.crt
Max sessions per user   : unlimited
STATUS                  : XMPP server running

cms.local> pki verify cms_2019_2021.crt cms_2019_2021_inter.crt
Success

cms.local> pki match cms_2019_2021.key cms_2019_2021.crt
Matching certificate and private key
cms.local> 
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